"It sounded really terrible. The fact that he seems to be OK is amazing," witness Jan Tison said. "I just called 911 as soon as it happened and came up and checked to make sure he was OK. There was two other gentleman that helped him get out of the car."

Port Authority spokesman Jim Ritchie said the 71A bus was outbound from Downtown toward Oakland when the accident happened. He said the bus driver and a passenger were injured, as well as the driver of the car.

The injured people were being treated at UPMC Mercy and UPMC Presbyterian. Their conditions were not immediately known, but Ritchie said they did not suffer life-threatening injuries.

The cause of the crash is under investigation.

Photos: Port Authority bus, car collide

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At least two people were injured when a Port Authority bus and a car collided Thursday evening, according to emergency dispatchers.